Crank-arm lock



Feb. 26 1924. 1,484,875

. A. R. CLAS CRANK ARM LOCK Filed Nov. 15, 1922 k y a 3 a "-i; J

INVENTUR- 7 6 Patented Feb. 26, 1%24 ANGELQ RUIBERT ELM, 0F TOLEDQ, OHIO.

casein-amt noon.

Application filed. November 13, 1922. Serial No. 600,784.

To all whom it may concern:

Be it known that l, ANGELO Bonnier CLAs, a citizen of the United States, and a resident of Toledo, in the county. of Lucas and State of Ohio, have made an linvention Appertaining to a Qrank-Arm Lock; and I do hereby declare the following to be a full, clear, and exact description of the invention, such' as will enable others skilled in the art to which it appertains to'make and use the same, reference being had tothe accompanying drawings, and to the characters of reference marked thereon, which form part of this specification.

This invention relates to means for locking a crank arm against turning, at least in one direction, and is intended particularly for use in connection with control means for raising and lowering windows.

The object of the invention is the provision of a simple and eiiicient means for securing an operating crank in any position of its turning movement, which means is easily operable, is inexpensive in its construction, and is capable of having the parts thereof easily and quickly assembled.

The invention is fully described in the following specification, and while in its broader aspect it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

Figure 1 is a fragmentary sectional view of a casing having a means embodying the invention attached thereto and partly in section, the crank being released for free turning movements, Fig. 2 is a similar view, with the locking means in looking position. Fig. 3 is a section on the line 33 in Fig. 1,

and Fig. 4 is a perspective view of the spring locking pawl member.

Referring to the drawings, 1 designates the casing of a window or door in which a glass may be mounted for vertical opening and closing movements, and 2 is a rotating part, in the present instances a drum, of a control means for raising and lowering the glass. The part 2-is mounted on the stub shaft 3 for turning movements within the casing 1, and the shaft is 'rotatably mounted in a bearing 4 carriedby the casing and projected outwardly therethrough, as is well understood in the art.

A crank 5 is fixedly secured to the outer end of the shaft 3 without the bearing 4 to adapt it when turned to impart rotation to the shaft. The crank has its hub portion surrounded by a concentric housing part 6, which extends inwardly in surrounding relation to the outer end portion of the bearing on 4 in protecting relation to a toothed wheel 7, which is fixedly mounted on the outer end portion or the bearing l and, in the present instance. has its teeth in the form of ratchet teeth. The wheel 7 is shown as being threaded on the bearing 4: and secured thereto by a lock nut 8.

A spring pawl 9 for engaging the teeth of the wheel 7 is mounted within the housing portion 6 of the crank 5 and fixed to the W crank or to the shaft 3 for turning move ments therewith. The spring action oi this pawl is such as to normally retain it out of engagement into engagement with the teeth. by means hereinafter described. For cheapness and convenience in manufacture and assembling, the pawl 9 is provided at its iii-- ner end with a carrying arm 10, which ea:- tends inwardly therefrom in radial relation to the crank axis and is provided with 'an opening 11 at its inner end which fits over and interengages with the outer crank receiving end portion 3 of the shaft 3 at the inner side of the crank for turning movements therewith. lit is preferable to stamp or form the pawl 9, and its carrying arm 10 in a single piece from sheet metal. The pawl 9 in the present instance is of suiiicient length to describe slightly more than a quarter of a circle and its free end is formed with an inwardly projecting tooth 12 for engagement with the teeth of the, wheel 7 when the pawl is moved inward f from its normal position, thus locking the" crank arm 5 againstcturning in one direc tion.

The control means for the pawl 9, in the presentinstance, comprises a plunger 13, which is mounted in the crank arm for movements longitudinally thereof and has its inner end ositioned to be projected within the housing 6 in depressing engagement with the outer side of the pawl 9 a short distance at the rear of its free end. The plunger 13 is normally held in retracted position within the crank arm by a coiled compression spring 14 mounted within the arm and having its inner end thrust against the arm and its outer end thrust against the outer headed end 15 of the plunger. The movement of the wrist-pin 16 of the crank arm in o and. out of operative position is utilized to depress and permit a retraction of the plunger 13. For this purpose the wrist-pin is pivoted at its inner end within the crank arm 5 for swinging movements longitudinally of the crank arm to permit it to be placed in extended relation thereto, as shown in Fig, 2, or in transverse operative relation thereto, as shown in Fig. 1. The inner end of the wrist-pin has camming coaction with the plunger 15 so that when the wrist-pin is moved to its operative position the plunger is permitted to move outward to release the pawl 9 from locking engagement with the wheel 7, and when the wrist-pin is moved to its inoperative position, as shown in Fig. 2, the plunger is forced inward to move the pawl 9 into locking engagement with the wheel 7.

It is evident that if the wheel 7 is provided with ratchet teeth, as shown in the present instance, the engagement of the pawl 9 therewith will positively prevent a turning of the crank arm in one direction, but will permit a turning of the crank arm in the opposite direction, due to the free end portion of the pawl without the plunger 13 riding outward on the tapered surfaces of the teeth and springing from one to an: other thereof, For this purpose it isimportant to have the plunger 13 engage the pawl 9 a sufiicient distance inwardly from its free end to permit a sufiicient swinging action of such end of the pawl to allow the teeth'ot the wheel to pass thereunder when the crank arm is turned in a rearward direction.

In the use of my locking means in connection with a window regulating device, it will be understood that the pawl when in engagement with the wheel 7 prevents a lowering movement of the window, but permits a raising of the window without first releasing the pawl from the wheel due to the pawl swinging from one tooth to another.

I wish it understood that my invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of embodiment in numerous forms without'departing from the spirit of th claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is,

1. In combination, a stationary member having an annular toothed portion, a crank mounted for turning movements relative to the member, a spring pawl movable with the crank and adapted to be placed in engagement with the member teeth, the pawl normally standing out of engagement with the teeth, and means carried by the crank and resent a operable to move the pawl into tooth engaging position and to release the pawl, the engagement of the means with the pawl being in rearwardly spaced relation to the tooth engaging portion of the pawl to permit the pawl to spring out of engagement with the teeth when held in tooth engaging position by the means. I

2. In combination, a stationary member, a crank mounted for turning movements relative to the member and around a part there of, a ratchet wheel carried by one and a spring pawl carried by the other of said member and crank and adapted to engage one with the other to lock the crank against turning in one direction, and means carried by the crank and operable to act on the pawl in rearwardly spaced relation to its end to force it into engagement with the wheel teeth and when in engagement therewith to permit the free end of the pawl to swing out of en gagement with the wheelteeth.

3. In combination, a bearing member, a shaft journaled in said member, a ratchet wheel fixed to the member, a spring pawl of segmental form encircling a portion of the ratchet wheel periphery and having an arm projecting from its inner end and mounted on the shaft to turn therewith, the free end of the pawl normally standing out of engagement with the ratchet teeth and being movable into locking engagement therewith, a

crank mounted on the shaft without the pawl arm and having a portion overhanging'the pawl,'and means carried by the crank and operable to engage the pawl at the rear of its free end and to force the pawl into releasable spring engagement with the ratchet wheel teeth.

4. In combination, a bearing member, a shaft journaled in said/member, a ratchet wheel fixed to the member, a spring pawl of segmental form encircling a portion of the ratchet wheel periphery and having an arm projecting from its inner end and mounted on the shaft to turn therewith, the free end of the pawl normally standing out of engagement with the ratchet teeth and being movable into locking engagement therewith, a crank mounted on the shaft without the pawl arm and having a portion overhanging the pawl, a wrist pin pivoted to the crank for swinging movements lengthwise thereof into and out of operative position, and means including a plunger carried by the crank and operable to engage the pawl at the rear of its free end and force it into catch engagement with the ratchet wheel when the wrist pin is moved to inoperative position.

In testimony whereof l have hereunto signed my name to this specification.

ANGELO ROBERT CLAS. 

